College Physics (4th Edition)

Published by McGraw-Hill Education
ISBN 10: 0073512141
ISBN 13: 978-0-07351-214-3

Chapter 13 - Conceptual Questions - Page 495: 13

Answer

Since the pressure decreases, then the volume must increase.

Work Step by Step

The ideal gas law states: $PV = nRT$ As the balloon rises into the air, the atmospheric pressure decreases. If the temperature is constant, then the value $PV$ must also be constant. Since the pressure decreases, then the volume of the balloon must increase.
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